KR100614472B1 - Signal transmission device, signal transmission method, electronic device, and electronic equipment - Google Patents

Abstract

An object of the present invention is to reduce a transmission path while maintaining a low speed drive (low power consumption) when transmitting a signal.

The signal transmission device includes a plurality of first parallel signals A ₁ ,... , A _n is at least one serial signal B ₁ ,. , The parallel / serial conversion section 20 for converting to B _n and the serial signal B _l ,... Converted in the parallel / serial conversion section 20. , One or more serial transmission paths 22 for transmitting B _n .

Scan Line Driver, Serial / Parallel Converter, Memory

Description

SIGNAL TRANSMISSION DEVICE, SIGNAL TRANSMISSION METHOD, ELECTRONIC DEVICE, AND ELECTRONIC EQUIPMENT}

1 shows a circuit of an electronic device according to a first embodiment of the present invention.

2 is a diagram illustrating details of a circuit of a signal transmission device.

3 is a diagram illustrating details of a circuit of a signal transmission device.

4 is a diagram illustrating a structure of an electronic device according to a first embodiment.

Fig. 5 is an enlarged view of a portion of the V-V line cross section in Fig. 4.

6 is a diagram illustrating details of an operation unit.

7 is a view for explaining the operation of the signal transmission apparatus according to the first embodiment.

8 shows a circuit of a signal transmission device according to a second embodiment of the present invention.

9 shows a circuit of a signal transmission device according to a second embodiment of the present invention.

10 is a diagram showing a part of a circuit of an electronic device according to a third embodiment of the present invention;

FIG. 11 is a view showing a part of a circuit of a signal transmission device included in the electronic device shown in FIG. 10; FIG.

12 illustrates an electronic device having a semiconductor device according to the present embodiment.

Fig. 13 shows an electronic device having a semiconductor device according to the present embodiment.

<Explanation of symbols for the main parts of the drawings>

10: parallel signal output unit

16: first parallel transmission line

20: parallel / serial converter

22: serial transmission line

24: sampling switch

26: sampling switching control

28: sampling switching transmission path

30: serial / parallel converter

32: second parallel transmission line

34: memory

36: storage medium

38: write switch

40: readout switch

42: write switch control unit

44: write switching transmission path

46: read switch control unit

48: readout switching transmission path

50: first transistor

52: second transistor

60: operation unit

62: light emitting unit

70: first part

72: second part

74: first transmission unit

76: second transmission unit

The present invention relates to a signal transmission device, a signal transmission method, an electronic device, and an electronic device.

Conventionally, a signal transmission method has been a serial method and a parallel method. The serial system has been used, for example, for transmission and reception of signals of drive circuits and display panels in large liquid crystal displays. According to this, since a signal is serially transmitted to the transmission path, the transmission path can be reduced. However, since high speed driving is required, power consumption is large, noise is generated, and circuit operation may become unstable. On the other hand, the parallel system is used for transmitting and receiving signals of a driving circuit and a display panel in a small liquid crystal display, for example. According to this, since parallel signals are transmitted to a plurality of transmission paths, low-speed driving is sufficient, power consumption can be reduced, noise is generated less, and circuit operation is stabilized. There was a flaw needed.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the transmission path while maintaining a low speed drive (low power consumption) when transmitting a signal, and in particular, to provide a stable low speed operation and to reduce the number of wires and the number of terminals required for connection between components. It is to make it compatible.

(1) The signal transmission device according to the present invention includes: a parallel / serial conversion unit for converting a plurality of first parallel signals synchronously outputted in parallel into serial signals of at least one line;

One or more serial transmission paths for transmitting the serial signals converted by the parallel / serial converter;

Has

According to the present invention, since the plurality of first parallel signals are converted into at least one line serial signal, the number of serial transmission paths can be reduced.

(2) In this signal transmission device,

The serial signal may be output as a current signal.

(3) In this signal transmission apparatus,

You may further have a parallel signal output part which outputs the said 1st parallel signal.

(4) In this signal transmission apparatus,

A plurality of first parallel transmission paths for transmitting the plurality of first parallel signals may be further provided.

(5) In this signal transmission apparatus,

The parallel signal output section, the plurality of first parallel transmission paths, and the parallel / serial conversion section may be provided in a first component.

(6) In this signal transmission apparatus,

A serial / parallel converter may be further provided for converting the serial signal into a plurality of second parallel signals.

(7) In this signal transmission apparatus,

A plurality of second parallel transmission paths for transmitting the plurality of second parallel signals may be further provided.

(8) In this signal transmission apparatus,

The serial / parallel converter and the plurality of second parallel transmission paths may be provided in the second component.

(9) In this signal transmission apparatus,

Each said serial transmission path may have a 1st transmission part provided in the said 1st component, and a 2nd transmission part provided in the said 2nd component, The said 1st and 2nd transmission parts may be connected.

According to the signal transmission apparatus having all the contents of (1) to (9) described above, the first and second parallel signals are transmitted by the first and second parallel transmission paths. According to this, since the signal is transmitted in parallel, low speed driving is sufficient, power consumption can be reduced, and instability of operation due to noise or the like can be eliminated. In addition, since the first parallel signal is converted into a serial signal, the number of serial transmission paths is smaller than the number of first parallel transmission paths. Therefore, the transmission path can be made smaller than the parallel transmission of signals between the first and second components. As a result, the pitch of the serial transmission path can be widened. In addition, since the number of connecting portions of the first and second transmission sections, which are elements of the serial transmission path, can be reduced, the alignment of the first and second transmission paths can be simplified, and the positional shift can be reduced.

(10) In this signal transmission device,

The plurality of first parallel signals are parallel transmission of n lines,

The number of the plurality of first parallel transmission paths is n,

The serial signal is serially transmitted m serially on one line,

The serial signal is to be serially transmitted to each line divided into n / m lines,

The number of serial transmission paths is n / m,

The number of the plurality of second parallel transmission paths may be n.

(11) In this signal transmission apparatus,

The plurality of first parallel signals are parallel transmission of n lines,

The number of the plurality of first parallel transmission paths is n,

The serial signal is divided into x lines and serially transmitted on each line.

The number of the serial transmission paths is x,

The number of the plurality of second parallel transmission paths may be n.

(12) In this signal transmission apparatus,

The plurality of first parallel signals may be analog signals.

(13) In this signal transmission device,

The parallel / serial converter may have a sampling switch for switching the connection of one group of the plurality of first parallel transmission paths and the one serial transmission path.

(14) In this signal transmission apparatus,

A plurality of said sampling switches are provided,

Each said sampling switch may be provided in the path | route between one transmission path of the said 1st parallel transmission path, and one said serial transmission path.

(15) In this signal transmission apparatus,

The parallel / serial converter may further include a sampling switch controller for controlling the plurality of sampling switches to be turned on in sequence.

(16) In this signal transmission apparatus,

The parallel / serial converter further has a plurality of sampling switching transmission paths connecting the sampling switch control unit and control terminals of the plurality of sampling switches.

The sampling switch control unit may sequentially transmit a sampling switching signal to the plurality of sampling switching transmission paths.

(17) In this signal transmission apparatus,

The number of the plurality of sampling switching transmission paths may be m.

(18) In this signal transmission apparatus,

The number of the plurality of sampling switching transmission paths may be n / x.

(19) In this signal transmission apparatus,

The serial / parallel conversion section may have a plurality of storage sections, and each of the storage sections may store information corresponding to one of the serial signals.

(20) In this signal transmission device,

Each of the storage units may have a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium.

(21) In this signal transmission device,

The serial / parallel conversion section may further have a write switch control section for controlling the write switches to be sequentially turned on in one of the plurality of storage sections.

(22) In this signal transmission apparatus,

The serial / parallel converter further has a plurality of write switching transmission paths connecting the write switch control unit and the control terminal of the write switch,

The write switch control unit may transmit a write switching signal sequentially to the plurality of write switching transmission paths.

(23) In this signal transmission device,

The number of the plurality of write switching transmission paths may be m.

(24) In this signal transmission device,

The number of the plurality of write switching transmission paths may be n / x.

(25) In this signal transmission apparatus,

The storage medium is a capacitor and may hold electric charge as the information.

(26) In this signal transmission apparatus,

Each of the plurality of second parallel signals may be a current signal.

(27) In this signal transmission apparatus,

Each said storage part has a first and a second transistor,

Each of the first and second transistors has first, second and third terminals,

A current flowing between the first and second terminals is controlled by a voltage applied between the first and third terminals,

The first terminals of the first and second transistors are connected, the third terminals are connected,

The second and third terminals of the first transistor are connected,

The one serial transmission path and the second terminal of the first transistor are connected,

One of the plurality of second parallel transmission paths and the second terminal of the second transistor are connected,

The capacitor may be connected between the third terminal and the first terminal.

(28) In this signal transmission apparatus,

The write switch performs on / off operation of the first and second paths,

The first path is between the second terminal of the first transistor and one of the serial transmission paths,

The second path may be a path branching from the path between the first path and the second terminal of the first transistor to the third terminal.

(29) In this signal transmission apparatus,

The first and second transistors may be field effect transistors, the first and second terminals may be source and drain terminals, and the third terminal may be a gate terminal.

(30) In this signal transmission device,

In at least one storage unit of the plurality of storage units, the gains of the first and second transistors are the same,

The magnitude | size of the input signal and output signal to the said at least 1 memory part may be equal.

(31) In this signal transmission device,

In at least one storage unit of the plurality of storage units, gains of the first and second transistors are different,

The magnitude of the input signal and the output signal to the at least one storage unit may be different.

(32) In this signal transmission apparatus,

The serial signal is output as a voltage signal,

Each of the plurality of second parallel signals may be a voltage signal.

(33) In this signal transmission apparatus,

The capacitor has a first terminal connected to a path connecting one of the serial transmission path and one of the plurality of second parallel transmission paths, and a second terminal connected to a constant potential,

The write switch is provided in a path between the first terminal and one serial transmission path;

The read switch may be provided in a path between the first terminal and one of the plurality of second parallel transmission paths.

(34) In this signal transmission apparatus,

You may further have a buffer connected between the said 1st terminal and the said read switch.

(35) An electronic device according to the present invention includes the signal transmission device;

An operating part installed on the second part

Has,

The operation unit is operated in accordance with the plurality of first parallel signals.

(36) In this electronic device,

The operation unit is a display unit,

The plurality of second parallel transmission paths may be data lines.

(37) In this electronic device,

The operation portion may have a plurality of light emitting portions.

(38) In this electronic device,

The plurality of light emitting parts emit light of a plurality of colors, and each of the light emitting parts emits light of any one color,

The light emitting part of at least one color is different from the light emitting part of different colors,

Each of the storage units is provided corresponding to the light emitting units of respective colors,

Depending on the luminous efficiency, the gain ratios of the first and second transistors may be set in the respective storage units.

(39) In this electronic device,

In the storage section corresponding to the light emitting section of any one color, the gain ratio of the first and second transistors is 1,

In the storage section corresponding to the light emitting section of two or more different colors, the gain ratio of the first and second transistors may be set to other than one.

(40) In this electronic device,

The plurality of light emitting parts emit light of a plurality of colors, and each of the light emitting parts emits light of any one color,

The light emitting part of at least one color is different from the light emitting part of different colors,

Each said buffer is provided corresponding to the said light emitting part of each color,

The energy amplification ratio of the buffer may be set in accordance with the luminous efficiency.

(41) In this electronic device,

Liquid crystal may be provided in the said operation part.

(42) An electronic device according to the present invention includes the electronic device,

An operation unit of the electronic device

Has

(43) The signal transmission method according to the present invention comprises (a) outputting a plurality of first parallel signals which are output in parallel in synchronization with each other by transmitting them from the parallel signal output section to the plurality of first parallel transmission paths,

(b) converting the plurality of first parallel signals into at least one line serial signal by a parallel / serial conversion unit and transmitting them to one or more serial transmission paths, and

(c) converting the serial signal into a plurality of second parallel signals by a serial / parallel converter and transmitting the plurality of second parallel transmission paths;

Including,

The parallel signal output unit, the plurality of first parallel transmission paths, and the parallel / serial conversion unit are provided in a first component,

The serial / parallel converter and the plurality of second parallel transmission paths are installed in a second component,

Each said serial transmission path has a 1st transmission part provided in the said 1st component, and the 2nd transmission part provided in the said 2nd component, The said 1st and 2nd transmission parts are connected.

In the present invention, the first and second parallel signals are transmitted by the first and second parallel transmission paths. According to this, since a signal is transmitted in parallel, low speed drive is enough, power consumption can be made small, and operation | movement is also stabilized. In addition, since the first parallel signal is converted into a serial signal, the number of serial transmission paths is smaller than the number of first parallel transmission paths. Therefore, the transmission path can be made smaller than the parallel transmission of signals between the first and second components. As a result, the pitch of the serial transmission path can be widened. In addition, since the number of connecting portions of the first and second transmission sections, which are elements of the serial transmission path, can be reduced, the alignment of the first and second transmission paths can be simplified, and the positional shift can be reduced.

(44) In this signal transmission method,

In the step (b), the sampling switch may switch the connection between one group of the plurality of first parallel transmission paths and one serial transmission path.

(45) In this signal transmission method,

A plurality of said sampling switches are provided,

Each sampling switch is provided in a path between one transmission path of the one group and one serial transmission path,

In the step (b), the sampling switch control unit may control the plurality of sampling switches to be sequentially turned on.

(46) In this signal transmission method,

The parallel / serial converter further has a plurality of sampling switching transmission paths connecting the sampling switch control unit and control terminals of the plurality of sampling switches.

In the step (b), a sampling switching signal may be sequentially transmitted to the plurality of sampling switching transmission paths by the sampling switch control unit.

(47) In this signal transmission method,

The serial / parallel conversion section has a plurality of storage sections,

In the step (c), information corresponding to one of the serial signals may be stored in each of the storage units.

(48) In this signal transmission method,

Each of the storage units has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium,

In the step (c), the write switch control unit may control the write switch to be sequentially turned on in the storage unit of the group among the plurality of storage units.

(49) In this signal transmission method,

The serial / parallel converter further has a plurality of write switching transmission paths connecting the write switch control unit and the control terminal of the write switch,

In the step (c), the write switch control unit may sequentially transmit a write switching signal to the plurality of write switching transfer paths.

(50) In this signal transmission method,

The storage medium is a capacitor,

Each said storage part has a first and a second transistor,

In the step (c), the charge according to the control voltage of the current flowing through the first transistor is accumulated in the capacitor, and the second transistor is controlled by the voltage according to the charge, so that the plurality of second parallel transmission paths are provided. You may flow a current into one of them.

(51) In this signal transmission method,

In at least one storage unit of the plurality of storage units, the gains of the first and second transistors are the same,

In the step (c), a current having the same magnitude as that of the current input to the at least one storage unit may be output.

(52) In this signal transmission method,

In at least one storage unit of the plurality of storage units, gains of the first and second transistors are different,

In the step (c), a current having a different magnitude from the current input to the at least one storage unit may be output.

(53) In this signal transmission method,

The storage medium is a capacitor,

In the step (c), charge may be accumulated in the capacitor, and a voltage corresponding to the charge may be applied to one of the plurality of second parallel transfer paths.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings.

(First embodiment)

1 is a diagram illustrating a circuit of an electronic device according to a first embodiment of the present invention. The electronic device has a signal transmission device 1. FIG.2 and FIG.3 is a figure explaining the detail of the circuit of a signal transmission apparatus.

The signal transmission device 1 has a parallel signal output section 10. As shown in Fig. 2, the parallel signal output unit 10 includes the first parallel signals A ₁ ,. , Prints A _n . A first parallel signals A _1, ... , A _n are output in synchronization. A first parallel signals A _1, ... , The number of A _n (for example, the same number as the signal supplied to the pixel in one horizontal scanning period) is n. In the present embodiment, the first parallel signals A ₁ ,... Although A _n is an analog signal (in this embodiment, it is a current signal but may be a voltage signal), the present invention does not exclude the case of a digital signal.

The parallel signal output section 10 may have a memory (for example, a frame memory) 12. When the electronic device is a display, a signal for displaying one screen or a plurality of screens is stored in the memory 12. The digital signal is accumulated in the memory 12. The digital signal may be converted into an analog signal by the D / A converter 14. In this embodiment, the output signal (analog signal) from the D / A converter 14 is parallel / serial converted. However, as a modification, the parallel / serial converted digital signal may be input to the D / A converter. Specifically, the digital signal output from the memory 12 in a parallel manner may be subjected to parallel / serial conversion by applying the present invention, and the digital signal output in the serial manner may be D / A converted. This can reduce the circuit area occupied by the D / A converter. In the color display, the first parallel signal A ₁ ,... Each of A _n may be a signal to each of the sub-pixels of a plurality of colors (for example, R, G, and B) constituting one pixel. However, the combination of signals for parallel / serial conversion by applying the present invention is not limited to R, G, and B, and can be selected as necessary. A first parallel signals A _1, ... , A _n is transmitted by the plurality of first parallel transmission paths (for example, wiring) 16. The number of the first parallel transmission paths 16 is n.

The signal transmission device 1 has a parallel / serial converter 20. The parallel / serial converting unit 20 performs the first parallel signal A ₁ ,. , A _n is at least one serial signal B ₁ ,. , Convert to B _n . In this embodiment, the serial signals B ₁ ,... , B _n is a current signal, but may be a voltage signal. Serial signal B ₁ ,. , B _n forms a column of m each. In the color display, the serial signals of one column (for example, B _l , B ₂ , B ₃ ) are the first parallel signals A ₁ ,. , First parallel signals A ₁ ,... Corresponding to a plurality of sub-pixels constituting one pixel of A _n (for example, three of red (R), green (G), and blue (B)). , A _n may be sufficient.

As a variant, two first parallel signals (e.g., A ₁ and A ₂ ) transmitted by two first parallel transmission paths 16 located adjacent to each other are converted into one serial signal (e.g., B). ₁ , B ₂ ). In addition, the input frequency of the 1st parallel signal converted into a serial signal may be four or more, and the 1st parallel transmission path 16 to which the 1st parallel signal is transmitted may not be located adjacent to each other.

Serial signal B ₁ ,. , The number of columns of B _n is n / m. Serial signal B ₁ ,. , B _n is transmitted by one or more serial transmission paths (eg, wiring) 22. The number of serial transmission paths 22 is n / m.

The parallel / serial converter 20 has one or a plurality of sampling switches 24. One or a plurality of sampling switches 24 may be a first parallel channel which is converted into one group of transmission paths (for example, serial signals B ₁ , B ₂ , B ₃ in one row) of the plurality of first parallel transmission paths 16. switches the signal a _l, a _2, a in the first parallel transfer (16) to transfer _3), one connection on the serial transmission line (22). When a plurality of sampling switches 24 are provided, each sampling switch 24 is placed in a path between one of the first parallel transmission paths 16 in one group and one serial transmission path 22. It is installed.

The parallel / serial converter 20 has a sampling switch controller 26. The sampling switch control unit 26 controls the sampling switches 24 to be turned on in order. In addition, all the sampling switches 24 do not necessarily need to be turned on. The sampling switch control unit 26 and the control terminals of the plurality of sampling switches 24 are connected by the plurality of sampling switching transmission paths 28. The number of sampling switching transmission paths 28 is m (the number of serial signals (for example, B ₁ , B ₂ , B ₃ ) in one column). The sampling switch control unit 26 sequentially transmits the sampling switching signals AR _i , AG _i , AB _i to the plurality of sampling switching transmission paths 28. For example, when the sampling switching signal AR _i is transmitted, the first parallel signal A ₁ (for example, the signal of R of the color display) is transmitted to the serial transmission line 22 as the serial signal B ₁ , and the sampling switching signal When AG _i is transmitted, the first parallel signal A ₂ (for example, the signal of G on the color display) is transmitted to the same serial transmission line 22 as the serial signal B ₂ , and when the sampling switching signal AB _i is transmitted, The first parallel signal A ₃ (for example, the signal of B of the color display) is transmitted to the same serial transmission line 22 as the serial signal B ₃ .

The signal transmission device 1 has a serial / parallel converter 30. As shown in Fig. 3, the serial / parallel conversion section 30 is connected to the serial signals B ₁ ,. , B _n is the second parallel signal C ₁ ,. , Convert to C _n . In the present embodiment, the plurality of second parallel signals C ₁ ,... , C _n are each current signals dl. Second parallel signal C ₁ ,. , The number of C _n is n (the same number as the first parallel signal A ₁ , ..., A _n ). Second parallel signal C ₁ ,. , C _n is transmitted by a plurality of second parallel transmission paths (for example, wiring) 32. The number of the second parallel transmission paths 32 is n (the same number as the first parallel transmission paths 16).

The serial / parallel conversion section 30 has a plurality of storage sections 34. Each storage unit 34 has serial signals B ₁ ,. Stores information corresponding to one of B _n . Each storage unit 34 includes a storage medium 36 for storing information, a write switch 38 for writing information to the storage medium 36, and a read switch for reading information from the storage medium 36. 40. The storage medium 36 is a capacitor (capacitor) and may hold charge as information.

The serial / parallel conversion unit 30 stores information corresponding to one group of storage units 34 (one serial signal (for example, B ₁ , B ₂ , B ₃ ) of the plurality of storage units 34). The plurality of storage sections 34 have a write switch control section 42 that controls the write switches 38 to be turned on in order. The write switch control section 42 and the control terminals of the write switch 38 are connected by a plurality of write switching transmission paths 44. The number of write switching transmission paths 44 is m (the number of serial signals (for example, B ₁ , B ₂ , B ₃ ) in one column). The write switch control unit 42 sequentially transmits the write switching signals IR _i , IG _i , and IB _i to the plurality of write switching transmission paths 44. For example, when the write switching signal IR _i is transmitted, the serial signal B _l (e.g., the signal of R on the color display) is stored, and when the write switching signal IG _i is transmitted, the serial signal B ₂ (e.g., color). The signal G of the display) is stored, and the serial signal B ₃ (for example, the signal of B of the color display) is stored when the write switching signal IB _i is transmitted.

The serial / parallel conversion section 30 has a read switch control section 46 that controls the read switch 40. The read switch control section 46 and the control terminal of the read switch 40 are connected by the read switching transmission path 48. The read switch control section 46 transmits the read switching signal O _i to the read switching transmission path 48. In the present embodiment, when the read switching signal O _i is transmitted, the information of all the storage units 34 is read in unison. Accordingly, the second parallel signal C _l ,... , C _n is output.

Each storage unit 34 has first and second transistors 50 and 52. Each of the first and second transistors 50 and 52 shown in FIG. 3 is a field effect transistor (for example, a MOS transistor), but may be a bipolar transistor. Each of the first and second transistors 50, 52 has first and second terminals (source and drain terminals) and a third terminal (gate terminal). The current flowing between the first and second terminals (source and drain terminals) is controlled by the voltage V _GS applied between the first terminal (eg, source terminal) and the third terminal (gate terminal).

Each storage unit 34 has a current mirror circuit. In the first and second transistors 50 and 52, first terminals (eg, source terminals) are connected to each other, and third terminals (gate terminals) are connected to each other. In the first transistor 50, a second terminal (for example, a drain terminal) and a third terminal (gate terminal) are connected. One serial transmission path 22 and a second terminal (for example, a drain terminal) of the first transistor 50 are connected. One second parallel transfer path 32 and a second terminal (for example, a drain terminal) of the second transistor 52 are connected. The capacitor as the storage medium 36 includes a third terminal (gate terminal) of the first and second transistors 50 and 52 and a first terminal (for example, a source) of the first and second transistors 50 and 52. Terminal). First terminals (eg, source terminals) of the first and second transistors 50 and 52 are connected to a constant potential (eg, ground potential).

In the at least one storage unit 34, when the gains of the first and second transistors 50 and 52 are the same, the input signal (for example, the serial signal B ₁ ) and the output signal (to the storage unit 34) ( For example, the magnitudes of the second parallel signal C ₁ ) are the same. In the at least one storage unit 34, when the gains of the first and second transistors 50 and 52 are different, the input signal (for example, the serial signal B ₁ ) and the output signal (to the storage unit 34) are different. For example, the magnitude of the second parallel signal C _l ) is different. In that case, all serial signals B ₁ ,... , B _n are set to the same magnitude, and the second parallel signal C ₁ ,... , The size of C _n can be different.

The write switch 38 performs on / off operation of the first and second paths. Here, the first path is between the second terminal (eg, drain terminal) of the first transistor 50 and one serial transmission path 22. The second path is a path branching from the path between the first path and the second terminal (eg, the drain terminal) of the first transistor 50 to the third terminal (gate terminal).

As shown in FIG. 1, the electronic device according to the present embodiment has an operation unit 60. The operation unit 60 includes a plurality of second parallel signals C ₁ ,... , C _n is input. As described above, the second parallel signal C ₁ ,... , C _n is the first parallel signal A ₁ ,. , A _n is converted. Therefore, the operation unit 60 includes a plurality of first parallel signals A ₁ ,. , A can be said to operate according to A _n . In this embodiment, the operation unit 60 is a display unit, and the second parallel transmission path 32 is a data line to the display unit.

The operation unit 60 has a plurality of light emitting units 62. The plurality of light emitting parts 62 emit light of a plurality of colors, and each of the light emitting parts 62 may emit light of any one color. The light emitting unit 62 of at least one color has a light emitting unit 62 having a different color of light emission efficiency (for example, a ratio of light emission energy (for example, light emission luminance) to input energy (for example, current)). It may be different from. Each light emission part 62 is a sub pixel, and one pixel is comprised by the sub pixel of multiple colors (for example, RGB). The arrangement of the light emitting units (sub pixels) 62 may be any of vertical stripes, delta arrays, and square arrays, for example. The second parallel signal C ₁ ,... From the second parallel transmission path (data line) 32 to the group of light emitting sections 62 selected by the scanning line driver 64 among the plurality of light emitting sections 62. , C _n (eg, a current signal) is input. A plurality of scan lines 66 are connected to the scan line driver 64, and a group of light emitting units 62 connected to a group of select switches 68 turned on by a scan signal input to any one scan line 66. ), The second parallel signal C ₁ ,. , C _n is input.

In addition, the memory units 34 may be provided corresponding to the light emitting units 62 of respective colors. The gain ratios β ₂ / β ₁ of the first and second transistors 50, 52 may be set in the storage units 34 in accordance with the luminous efficiency. For example, in the storage unit 34 corresponding to any one color light emitting unit 62, the gain ratios β ₂ / β _{1 of} the first and second transistors 50 and 52 are 1, and the other 2 In the storage unit 34 corresponding to the light emitting unit 62 of two or more colors, the gain ratios β ₂ / β _{1 of} the first and second transistors 50 and 52 may be set to other than one.

FIG. 4 is a diagram illustrating a structure of an electronic device according to the present embodiment, and FIG. 5 is an enlarged view of a cross section taken along the line VV of FIG. 4. The electronic device has first and second components 70, 72. The first component 70 is, for example, a flexible substrate. The parallel signal output section 10, the first parallel transmission path 16, and the parallel / serial conversion section 20 are provided in the first component 70. The parallel signal output unit 10, the first parallel transmission path 16, and the parallel / serial conversion unit 20 may be incorporated in one integrated circuit chip (for example, a semiconductor chip). The package form of the first component 70 on which the integrated circuit chip is mounted may be a tape carrier package (TCP).

The serial / parallel conversion unit 30 and the second parallel transmission path 32 are provided in the second component 72. The second component 72 may be a rigid substrate such as glass or plastic, or may have light transmittance. In addition, the operation part 60 and the scanning line driver 64 may also be provided in the 2nd component 72, and in this case, the 2nd component 72 is displayed in a panel (for example, display of an organic EL (Electroluminescence) panel etc.). Panel). The serial / parallel conversion unit 30, the second parallel transmission path 32, and the scan line driver 64 may be formed on the second component 72. In that case, the low-temperature polycrystalline silicon film-forming technique may be applied.

As shown in FIG. 5, the first and second components 70 and 72 are fixed. An adhesive may be used for fixing. Each serial transmission path 22 has a first transmission part 74 provided in the first component 70 and a second transmission part 76 provided in the second component 72. The first and second transmission units 74 and 76 are connected to each other. If the 1st and 2nd transmission parts 74 and 76 are wiring, they are electrically connected. For the connection, an anisotropic conductive material (anisotropic conductive film, anisotropic conductive paste or the like) may be used, an insulating adhesive (paste) may be used, or a metal joint may be applied.

In the present embodiment, the first and second parallel signals A ₁ ,... By the first and second parallel transmission paths 16, 32. , A _n and C ₁ ,. , Send C _n . According to this, since a signal is transmitted in parallel, low speed drive is enough and power consumption can be made small. Further, the first parallel signal A ₁ ,... , A _n is the serial signal B _l ,. , The number of serial transmission paths 22 is smaller than the number of first parallel transmission paths 16 since it is converted into B _n . Therefore, the transmission path can be made smaller than the parallel transmission of signals between the first and second components 70 and 72. As a result, the pitch of the serial transmission line 22 can be widened. In addition, since the number of connection portions of the first and second transmission units 74 and 76 which are elements of the serial transmission line 22 can be reduced, the alignment of the first and second transmission units 74 and 76 is simple. It is also possible to reduce the misalignment.

The electronic device according to the present embodiment is a display device (for example, a display module). As an example thereof, an example in which the second component 72 having the operation unit 60 is an organic EL (Electroluminescence) panel will be described.

6 is a diagram for explaining the details of the operation unit 60. The second component 72 is a substrate. The selector switch 68 is formed in the second component 72. When the selection switch 68 is a transistor, the scan line 66 is connected to the gate terminal thereof, the second parallel transfer path 32 is connected to one of the source and drain terminals, and the subpixel is connected to the other of the source and drain terminals. The electrode 78 is connected. The light emitting part 62 is provided in the sub pixel electrode 78. The light emitting portion 62 may have any one of R, G, and B light emitting materials, and may further have a hole transporting layer or an electron transporting layer. The light emitting material may be a high molecular material or a low molecular material. The light emitting portion 62 of the neighbors is divided into a bank portion 80. The counter electrode 82 is formed in the light emitting portion 62. In addition, when light from the light emitting portion 62 is emitted from the second component 72, the second component 72 has a light transmittance, and the sub pixel electrode 78 also has a light transmittance material (for example, , Indium tin oxide (ITO), or the like.

FIG. 7 is a diagram for explaining the operation of the signal transmission apparatus according to the present embodiment. In detail, FIG.

As shown in Fig. 2, the first parallel signals A ₁ ,... , A _n is output from the parallel signal output unit 10 and transmitted to the first parallel transmission path 16. All first parallel signals A ₁ ,... , A _n may be transmitted simultaneously.

... First parallel signals A ₁ ,... Transmitted to the first parallel transmission path 16. , A _n is input to the parallel / serial converter 20. The parallel / serial conversion section 20 causes the first parallel signal A ₁ ,... , A _n is at least one serial signal B _l ,. , B _n is converted into one or more serial transmission paths 22. In the parallel / serial converter 20, one or more sampling switches 24 are used to transmit one group of transmission paths (for example, serial signals B ₁ , 1 of the plurality of first parallel transmission paths 16). B _2, and switches the first parallel signals a _1, a _2, a in the first parallel transfer (16) to transfer _3), one connection on the serial transmission line 22 to be converted to B _3. Here, the sampling switch control unit 26 may control the sampling switch 24 to be turned on in order. Specifically, the sampling switch control section 26 may sequentially transmit the sampling switching signals AR _i , AG _i , AB _i to the sampling switching transmission path 28 as shown in FIG. 7.

Serial signals B ₁ ,... Transmitted to the serial transmission path 22. , B _n is input to the serial / parallel converter 30. The serial / parallel converter 30 causes the serial signals B ₁ ,. , B _n is the second parallel signal C ₁ ,. , C _n is converted and transmitted to the second parallel transmission path 32. In the serial / parallel converter 30, the serial signals B ₁ ,... Stores information corresponding to one of B _n . For example, a plurality of storage units for storing information corresponding to one group of storage units 34 (one serial signal (for example, B ₁ , B ₂ , B ₃ ) by the write switch control unit 42). (34), the write switch 38 may be controlled to be turned on in order. In detail, the write switch control section 42 may sequentially transmit the write switching signals IR _i , IG _i , and IB _i to the write switching transmission path 44 as shown in FIG. 7. For example, when the sampling switching signal AR _i is input, the serial signal B _l is output. Since the write switching signal IR _i is input while the sampling switching signal AR _i is being input, the information is stored in the corresponding storage unit 34.

Serial signal B _l ,. The operation of each storage unit 34 when B _n is a current signal will be described. For example, when the write switch 38 is turned on and the serial signal B ₁ is input, the read switch 40 is turned off. In this state, in the first transistor 50, current flows between the first and second terminals (source and drain terminals) by the voltage V _GS applied to the third terminal (gate terminal) based on the serial signal B ₁ . . In addition, charges corresponding to the voltage V _GS are stored in the capacitor as the storage medium 36. Thereafter, the same operation is sequentially performed on the serial signals B ₂ and B ₃ .

Serial signal B ₁ ,. When B _n is divided into a plurality of columns, information corresponding to one serial signal may be simultaneously stored in all columns. For example, serial signals B ₁ ,. , When B _n is divided into one column of three signals, the serial signals B ₁ , B ₄ , B ₇ ,. , Information is stored simultaneously for B _n-2 , and then serial signals B ₂ , B ₅ , B ₈ ,. And B _nl at the same time to store information, and then serial signals B ₃ , B ₆ , B ₉ ,. , Information may be stored simultaneously for B _n .

Then, when information is stored in all of the storage units 34, the write switch 38 is turned off, and the read switch 40 is turned on, the second parallel signal (current signal) C ₁ ,. , C _n is output. Specifically, the second transistor 52 is controlled by the charge accumulated in the capacitor as the storage medium 36, and the second parallel signal (current signal) C _{1 is} provided at the first and second terminals (source and drain terminals). ,… , C _n flows. The read switch 40 is controlled by the read switching signal O _i from the read switch control section 46 as shown in FIG.

Here, when the gains of the first and second transistors 50 and 52 are the same, since the voltage V _GS applied to the third terminal (gate terminal) is the same, the input signal and the output signal are the same. That is, the second parallel signal (eg, C ₁ ) having the same size as the input serial signal (eg, B ₁ ) may be output.

When the gains of the first and second transistors 50 and 52 are different, a signal having a different magnitude from that of the input signal may be output. For example, when the gains of the first and second transistors 50 and 52 are β ₁ and β ₂ , respectively, the input signal I _in and the output signal I _out are

I _out = I _in × (β ₂ / β ₁ )

Has a relationship. By using this, a second parallel signal (eg, C ₃ ) having a different magnitude from the input serial signal (eg, B ₃ ) can be output. When the luminous efficiency of one color (for example, blue) light emitting material is poor in the organic EL, in the storage unit 34 corresponding to the light emitting unit 62 of that color,

1 <β ₂ / β ₁

The first and second transistors 50 and 52 are selected so that the current larger than the current (the second parallel signal (for example, C ₁ , C ₂ )) to the light emitting part 62 of a different color is obtained. Two parallel signals (for example, C ₃ ) can be input to the blue light emitting unit 62. By appropriately setting the gain coefficients of the transistors corresponding to R, G, and B, color balance and the like can be adjusted.

In the above operation, as shown in Fig. 7, the first parallel signal A ₁ ... , A _n is the serial signal B ₁ ,. , B _n , second parallel signal C ₁ ,. , While being converted to C _n , is input from the parallel signal output unit 10 to the operation unit 60.

In this embodiment, the first and second parallel signal A _l, ... , A _n and C ₁ ,. Since C _n is transmitted in a parallel manner, low speed driving is sufficient, power consumption can be reduced, and circuit operation is stable. Moreover, the number of connection terminals can be reduced by making serial transmission the connection part of the circuit formed on independent components. In addition, by optimizing the degree of serialization and the degree of parallelization, it is possible to balance the number of connection terminals, the stability of the operation, the reduction in speed, and the like.

In addition, by appropriately setting the gain ratios (gain ratios of the current mirror circuits) of the first and second transistors 50 and 52, for example, the luminance and the color balance can be adjusted. For example, in R (red), G (green), and B (blue), it is possible to adjust the color balance by appropriately setting the gain ratio of the current mirror circuit.

(Second embodiment)

8 and 9 are diagrams illustrating a circuit of a signal transmission apparatus according to a second embodiment of the present invention. As shown in FIG. 8, the signal transmission device has a parallel signal output unit 110. The parallel signal output unit 110 may be the same as the parallel signal output unit 10 of the first embodiment, such as having a memory 12 or a D / A converter 14. The signal transmission device has a parallel / serial converter 120. As shown in FIG. 9, the signal transmission device has a serial / parallel converter 130.

The parallel signal output unit 110 and the parallel / serial converter 120 are connected by a first parallel transmission path 116. The parallel / serial converter 120 and the serial / parallel converter 130 are connected by a serial transmission path 122. The second parallel transmission path 132 is connected to the serial / parallel conversion unit 130.

In the present embodiment, the first parallel signal D ₁ ,... , The number of D _n is n. The number of first parallel transmission paths 116 is n. The number of second parallel transmission paths 132 is n.

The number of serial transmission paths 122 is x. Serial signal E ₁ ,. The number of columns of E _n is x. For example, in the color display, the first parallel signals D ₁ ,... Corresponding to the three sub-pixels R, G, and B are provided. , D _n is the serial signal E ₁ ,. May be converted to E _n . Specifically,

First parallel signal D ₁ ,. , D _{n / 3} is the serial signal E ₁ ,. , E _{n / 3} ,

First parallel signal D _{(n / 3) +1} of one group; , D _{n / 2} is the serial signal E _{(n / 3) +1} in one column. , E _{n / 2} ,

First parallel signal D _{(n / 2) +1} of one group; , D _n is the serial signal E _{(n / 2) +1} of one column; May be converted to E _n .

In this embodiment, the number of sampling switching transmission paths 128 connected to the sampling switch control unit 126 shown in FIG. 8 is n / x. In addition, the number of the write switching transmission paths 144 connected to the write switch control unit 142 shown in FIG. 9 is n / x.

As shown in Fig. 9, serial signals E ₁ ,. , E _{n / 3} is the second parallel signal F ₁ ,. , F _{n / 3} ,

Serial signal E _{(n / 3) +1 in} one row; , E _{n / 2} is the second parallel signal F _{(n / 3) +1,.} , F _{n / 2} ,

Serial signal E _{(n / 2) +1 in} one column; , E _n is the second parallel signal F _{(n / 2) +1} of one group. , F _n is converted.

Other configurations and operations are the same as those described in the first embodiment. Also in this embodiment, the effects described in the first embodiment can be achieved.

(Third embodiment)

FIG. 10 is a view showing a part of a circuit of an electronic device according to a third embodiment of the present invention, and FIG. 11 is a view showing a part of a circuit of a signal transmission device of the electronic device shown in FIG. 10. As shown in FIG. 10, the electronic device according to the present embodiment has an operation unit 260. The operation unit 260 has a liquid crystal 262. This electronic device is a liquid crystal device (liquid crystal display, liquid crystal projector, etc.). Except for this and the necessary modifications, the contents of the operation unit 60 described in the first embodiment are applicable to the operation unit 260 of the present embodiment.

As shown in FIG. 11, the signal transmission apparatus according to the present embodiment has a serial / parallel converter 230. The serial / parallel conversion unit 230 includes serial signals G ₁ ,... Transmitted to the serial transmission path 222. , G _n is input. Serial signal G ₁ ,. , G _n is a voltage signal in this embodiment. The second parallel signal H ₁ ,... From the serial parallel converter 230 to the second parallel transmission path 232. , H _n is transmitted. Second parallel signal H ₁ ,. , H _n is the voltage signal. In this embodiment, since the voltage signal is output, the liquid crystal 262 can be driven.

The serial / parallel converter 230 has a plurality of memory units 234. Each memory unit 234 has a capacitor 236. The capacitor 236 includes a first terminal connected to a path connecting one serial transmission line 222 and one second parallel transmission path 232 and a first terminal connected to a predetermined potential (for example, a ground potential). It has two terminals. The write switch 238 is provided in the path between the first terminal of the capacitor 236 and one serial transmission path 222. The read switch 248 is provided in the path between the first terminal and one second parallel transmission path 232. A buffer (eg, a feedback circuit such as a voltage follower circuit or an amplifier circuit) 250 may be connected between the first terminal and the read switch 248.

According to the present embodiment, charges are accumulated in the capacitor 236, and a voltage corresponding to the charges can be applied to one of the plurality of second parallel transfer paths 232. The contents described in the first embodiment can be applied to other configurations and operations. In this embodiment as well, the effects described in the first embodiment can be achieved.

Although the present embodiment is a liquid crystal display device to which the present invention is applied, the contents of the present embodiment may be applied to an electronic device having a light emitting portion (for example, an inorganic EL element) which is driven by voltage instead of the liquid crystal 262. In that case, each buffer 250 may be provided corresponding to each light emitting part. When the buffer 250 is an amplifying circuit, the energy amplification ratio of the buffer 250 (or, in accordance with the light emission efficiency (for example, the ratio of light emission energy (for example, light emission luminance) to voltage) of each light emitting unit), Feedback characteristics) may be set. For example, in R, G, and B, the color balance can be adjusted by controlling the feedback characteristics.

(Other Examples)

As an example of an electronic device according to the present invention, FIG. 12 shows a notebook personal computer 2000 having the above-described electronic device (display) 2100 and its operation unit 2200. FIG. 13 shows a mobile phone 3000 having the above-described electronic device (display) 3100 and its operation unit 3200.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, the present invention includes a configuration substantially the same as the configuration described in the embodiment (for example, a configuration in which the functions, methods and results are the same, or a configuration in which the objectives and results are the same). In addition, this invention includes the structure which substituted the non-essential part of the structure demonstrated in the Example. Moreover, this invention includes the structure which shows the effect and the same effect as the structure demonstrated in the Example, or the structure which can achieve the same objective. Moreover, this invention includes the structure which added a well-known technique to the structure demonstrated in the Example.

As described above, according to the present invention, since the signal is transmitted in a parallel manner, the transmission path can be reduced while maintaining the low-speed driving (low power consumption), and in detail, it is necessary for the connection between the components while performing stable low-speed operation. The number of wirings and the number of terminals of a connection part can be reduced.

Claims (53)

A parallel / serial conversion unit for converting a plurality of first parallel signals that are output in synchronization in parallel to at least one serial signal; One or more serial transmission paths for transmitting the serial signals converted by the parallel / serial converter; A parallel signal output unit configured to output the plurality of first parallel signals; A plurality of first parallel transmission paths for transmitting the plurality of first parallel signals; A serial / parallel converter for converting the serial signal into a plurality of second parallel signals; Has a plurality of second parallel transmission paths for transmitting the plurality of second parallel signals, The parallel signal output unit, the plurality of first parallel transmission paths and the parallel / serial conversion unit are provided in a first component, The serial / parallel converter and the plurality of second parallel transmission paths are installed in a second component, Each said serial transmission path has a 1st transmission part provided in the said 1st component, and a 2nd transmission part provided in the said 2nd component, The said 1st and 2nd transmission part are connected. The method of claim 1, And the serial signal is output as a current signal. delete delete delete delete delete delete delete The method of claim 1, The plurality of first parallel signals are parallel transmission of n lines, The number of the plurality of first parallel transmission paths is n, The serial signal is serially transmitted m serially in one line, The serial signal is to be serially transmitted to each line divided into n / m lines, The number of serial transmission paths is n / m, And the number of the plurality of second parallel transmission paths is n. The method of claim 1, The plurality of first parallel signals are parallel transmission of n lines, The number of the plurality of first parallel transmission paths is n, The serial signal is divided into x lines and serially transmitted on each line. The number of the serial transmission paths is x, And the number of the plurality of second parallel transmission paths is n. The method according to any one of claims 1, 2, 10 or 11, And the plurality of first parallel signals are analog signals. The method of claim 10 or 11, And the parallel / serial conversion section has a sampling switch for switching the connection of one group of the plurality of first parallel transmission paths and the connection of one serial transmission path. The method of claim 13, A plurality of said sampling switches are provided, And each sampling switch is provided in a path between one of the first parallel transmission paths of the group and one serial transmission path. The method of claim 14, And the parallel / serial converting unit further comprises a sampling switch control unit which controls the plurality of sampling switches to be sequentially turned on. The method of claim 15, The parallel / serial converter further has a plurality of sampling switching transmission paths connecting the sampling switch control unit and control terminals of the plurality of sampling switches. And the sampling switch control unit sequentially transmits a sampling switching signal to the plurality of sampling switching transmission paths. The method of claim 10, The parallel / serial converter has a plurality of sampling switches for switching a connection of one group of the plurality of first parallel transmission paths and one serial transmission path, Each said sampling switch is installed in a path between one of said first parallel transmission paths of said group and one said serial transmission path, The parallel / serial converter further includes a sampling switch controller for controlling the plurality of sampling switches to be sequentially turned on, The parallel / serial converter further has a plurality of sampling switching transmission paths connecting the sampling switch control unit and control terminals of the plurality of sampling switches. The sampling switch control unit sequentially transmits a sampling switching signal to the plurality of sampling switching transmission paths. And the number of the plurality of sampling switching transmission paths is m. The method of claim 11, The parallel / serial converter has a plurality of sampling switches for switching a connection of one group of the plurality of first parallel transmission paths and one serial transmission path, Each said sampling switch is installed in a path between one of said first parallel transmission paths of said group and one said serial transmission path, The parallel / serial converter further includes a sampling switch controller for controlling the plurality of sampling switches to be sequentially turned on, The parallel / serial converter further has a plurality of sampling switching transmission paths connecting the sampling switch control unit and control terminals of the plurality of sampling switches. The sampling switch control unit sequentially transmits a sampling switching signal to the plurality of sampling switching transmission paths. And the number of the plurality of sampling switching transmission paths is n / x. The method of claim 10 or 11, And said serial / parallel conversion section has a plurality of storage sections, and each said storage section stores information corresponding to one of said serial signals. The method of claim 19, Wherein each of said storage sections has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium. The method of claim 20, And the serial / parallel conversion section further comprises a write switch control section for controlling the write switches to be sequentially turned on in one group of the plurality of storage sections. The method of claim 21, The serial / parallel converter further has a plurality of write switching transmission paths connecting the write switch control unit and the control terminal of the write switch, And the write switch control unit sequentially transmits a write switching signal to the plurality of write switching transmission paths. The method of claim 10, The serial / parallel conversion section has a plurality of storage sections, each of the storage sections stores information corresponding to one of the serial signals, Each of the storage units has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium, The serial / parallel conversion section further has a write switch control section for controlling the write switches to be sequentially turned on in the storage section of the group of the plurality of storage sections, The serial / parallel converter further has a plurality of write switching transmission paths connecting the write switch control unit and the control terminal of the write switch, The write switch control unit sequentially transmits a write switching signal to the plurality of write switching transmission paths, And the number of the plurality of write switching transmission paths is m. The method of claim 11, The serial / parallel conversion section has a plurality of storage sections, each of the storage sections stores information corresponding to one of the serial signals, Each of the storage units has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium, The serial / parallel conversion section further has a write switch control section for controlling the write switches to be sequentially turned on in the storage section of the group of the plurality of storage sections, The serial / parallel converter further has a plurality of write switching transmission paths connecting the write switch control unit and the control terminal of the write switch, The write switch control unit sequentially transmits a write switching signal to the plurality of write switching transmission paths, And the number of the plurality of write switching transmission paths is n / x. The method of claim 20, And the storage medium is a capacitor, and retains charge as the information. The method of claim 25, And each of the plurality of second parallel signals is a current signal. The method of claim 26. Each said storage part has a first and a second transistor, Each of the first and second transistors has first, second and third terminals, A current flowing between the first and second terminals is controlled by a voltage applied between the first and third terminals, The first terminals of the first and second transistors are connected, the third terminals are connected, The second and third terminals of the first transistor are connected, The one serial transmission path and the second terminal of the first transistor are connected, One of the plurality of second parallel transmission paths and the second terminal of the second transistor are connected, And the capacitor is connected between the third terminal and the first terminal. The method of claim 27, The write switch performs on / off operation of the first and second paths, The first path is between the second terminal of the first transistor and one serial transmission path, And the second path is a path branching from the path between the first path and the second terminal of the first transistor to the third terminal. The method of claim 27, And the first and second transistors are field effect transistors, wherein the first and second terminals are source and drain terminals, and the third terminal is a gate terminal. The method of claim 27, In at least one storage unit of the plurality of storage units, the gains of the first and second transistors are the same, And a signal transmission device having the same magnitude of an input signal and an output signal to the at least one storage unit. The method of claim 27, In at least one storage unit of the plurality of storage units, gains of the first and second transistors are different, And a signal transmission device having different magnitudes of an input signal and an output signal to the at least one storage unit. The method of claim 25, The serial signal is output as a voltage signal, And each of the plurality of second parallel signals is a voltage signal. The method of claim 32, The capacitor has a first terminal connected to a path connecting one of the serial transmission path and one of the plurality of second parallel transmission paths, and a second terminal connected to a constant potential, The write switch is provided in a path between the first terminal and one serial transmission path; The read switch is provided in a path between the first terminal and one of the plurality of second parallel transmission paths. The method of claim 33, wherein And a buffer connected between the first terminal and the read switch. Signal transmission device, Has an operating unit, The signal transmission device, A parallel / serial converter for converting a plurality of first parallel signals synchronously outputted in parallel into serial signals of at least one line; One or more serial transmission paths for transmitting the serial signals converted by the parallel / serial converter; A parallel signal output unit configured to output the plurality of first parallel signals; A plurality of first parallel transmission paths for transmitting the plurality of first parallel signals; A serial / parallel converter configured to convert the serial signal into a plurality of second parallel signals; Has a plurality of second parallel transmission paths for transmitting the plurality of second parallel signals, The parallel signal output unit, the plurality of first parallel transmission paths, and the parallel / serial conversion unit are provided in a first component, The serial / parallel conversion unit and the plurality of second parallel transmission paths are installed in a second component, The operation unit is installed in the second component, Each of the serial transmission paths has a first transmission part provided in the first part and a second transmission part provided in the second part, the first and second transmission parts being connected, The electronic device operates the operation unit according to the plurality of first parallel signals. 36. The method of claim 35 wherein The operation unit is a display unit, And the plurality of second parallel transmission paths are data lines. The method of claim 36, The operation unit has a plurality of light emitting unit. The method of claim 37, The serial / parallel conversion section has a plurality of storage sections, each of the storage sections stores information corresponding to one of the serial signals, Each of the storage units has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium, The storage medium is a capacitor, which holds charge as the information, Each of the plurality of second parallel signals is a current signal, Each said storage part has a first and a second transistor, Each of the first and second transistors has first, second and third terminals, A current flowing between the first and second terminals is controlled by a voltage applied between the first and third terminals, The first terminals of the first and second transistors are connected, the third terminals are connected, The second and third terminals of the first transistor are connected, The one serial transmission path and the second terminal of the first transistor are connected, One of the plurality of second parallel transmission paths and the second terminal of the second transistor are connected, The capacitor is connected between the third terminal and the first terminal, In at least one storage unit of the plurality of storage units, gains of the first and second transistors are different, Magnitudes of an input signal and an output signal to the at least one storage unit are different; The plurality of light emitting parts emit light of a plurality of colors, and each of the light emitting parts emits light of any one color, The light emitting part of at least one color is different from the light emitting part of different colors, Each of the storage units is provided corresponding to the light emitting units of respective colors, And the gain ratios of the first and second transistors are set in the storage units according to the luminous efficiency. The method of claim 38, In the storage section corresponding to the light emitting section of any one color, the gain ratio of the first and second transistors is 1, The electronic device of which the gain ratio of the said 1st and 2nd transistor is set to other than 1 in the said memory | storage part corresponding to the said light emitting part of two or more other colors. The method of claim 37, Further having a buffer connected between said first terminal and said read switch, The serial / parallel conversion section has a plurality of storage sections, each of the storage sections stores information corresponding to one of the serial signals, Each of the storage units has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium, The storage medium is a capacitor, which holds charge as the information, The serial signal is output as a voltage signal, Each of the plurality of second parallel signals is a voltage signal, The capacitor has a first terminal connected to a path connecting one of the serial transmission path and one of the plurality of second parallel transmission paths, and a second terminal connected to a constant potential, The write switch is provided in a path between the first terminal and one serial transmission path; The read switch is provided in a path between the first terminal and one of the plurality of second parallel transmission paths, The plurality of light emitting parts emit light of a plurality of colors, and each of the light emitting parts emits light of any one color, The light emitting part of at least one color is different from the light emitting part of different colors, Each said buffer is provided corresponding to the said light emitting part of each color, The energy amplification ratio of the buffer is set in accordance with the luminous efficiency. 36. The method of claim 35 wherein The electronic device is provided with a liquid crystal in the operation unit. The electronic device according to any one of claims 35 to 41, An operation unit of the electronic device Electronic device having. (a) synchronously outputting a plurality of first parallel signals output in parallel from the parallel signal output section to be transmitted to the plurality of first parallel transmission paths, (b) converting the plurality of first parallel signals into at least one line serial signal by means of a parallel / serial conversion unit and transmitting them to one or more serial transmission paths, and (c) converting the serial signal into a plurality of second parallel signals by a serial / parallel converter and transmitting the plurality of second parallel transmission paths; Including, The parallel signal output unit, the plurality of first parallel transmission paths, and the parallel / serial conversion unit are provided in a first component, The serial / parallel conversion unit and the plurality of second parallel transmission paths are installed in a second component, Each of the serial transmission paths has a first transmission part provided in the first part, a second transmission part provided in the second part, and the first and second transmission parts are connected. The method of claim 43, In the step (b), a sampling switch switches a connection between one group of transmission paths of the plurality of first parallel transmission paths and one serial transmission path. The method of claim 44, A plurality of said sampling switches are provided, Each sampling switch is provided in a path between one of the transmission paths of the group and one of the serial transmission paths, And in the step (b), controlling the sampling switches to turn on the plurality of sampling switches in order. The method of claim 45, The parallel / serial converter further has a plurality of sampling switching transmission paths connecting the sampling switch control unit and control terminals of the plurality of sampling switches. And (b) in the step (b), sequentially transmitting sampling switching signals to the plurality of sampling switching transmission paths by the sampling switch control unit. The method of claim 43, The serial / parallel conversion section has a plurality of storage sections, In the step (c), storing information corresponding to one of the serial signals in each of the storage units. The method of claim 47, Each of the storage units has a storage medium for storing the information, a write switch for writing the information on the storage medium, and a read switch for reading the information from the storage medium, In the step (c), the write switch control unit controls the write switch to turn on the write switch sequentially in the storage unit of the plurality of storage units. 49. The method of claim 48 wherein The serial / parallel converter further has a plurality of write switching transmission paths connecting the write switch control unit and the control terminal of the write switch, And in the step (c), sequentially transmitting a write switching signal to the plurality of write switching transmission paths by the write switch control unit. The method of claim 48 or 49, The storage medium is a capacitor, Each said storage part has a first and a second transistor, In the step (c), the charge according to the control voltage of the current flowing through the first transistor is accumulated in the capacitor, and the second transistor is controlled by the voltage according to the charge, so that the plurality of second parallel transmission paths are provided. A signal transmission method that causes a current to flow in either. 51. The method of claim 50, The gain of the first and second transistors is the same in at least one of the plurality of storage units, And in the step (c), outputting a current having the same magnitude as that input to the at least one storage unit. 51. The method of claim 50, In at least one storage unit of the plurality of storage units, gains of the first and second transistors are different, In the step (c), outputting a current having a magnitude different from that of the current input to the at least one storage unit. The method of claim 48 or 49, The storage medium is a capacitor, In the step (c), accumulating charge in the capacitor, and applying a voltage according to the charge to one of the plurality of second parallel transfer paths.

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